A throttle valve

Abstract

The application relates to a throttle valve and relates to the technical field of valves. The throttle valve comprises a valve body, a medium inflow channel, a throttle channel and a medium outflow channel are sequentially arranged in the valve body along the medium flow direction; a valve core is slidably connected in the throttle channel along the axial direction, the valve core comprises a plugging section and a throttle section which are arranged from top to bottom along the axial direction; the throttle section comprises a first wedge surface and a second wedge surface which are arranged from top to bottom along the axial direction; a first throttle gap is formed between the first wedge surface and the inner wall of the throttle channel, a second throttle gap is formed between the second wedge surface and the inner wall of the throttle channel, and the flow area of the first throttle gap is larger than that of the second throttle gap. The application improves the overall flow capacity of the valve, improves the throttling effect and flow capacity of the throttle valve, and makes the throttle valve adapt to harsh working conditions of high pressure and high flow rate.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a throttle valve. Background Technology

[0002] Currently, most commercially available throttling valves employ a single-stage throttling design. Their core flaw lies in the sudden increase in fluid velocity as it passes through this single throttling orifice, causing a sharp drop in local pressure below the fluid's saturated vapor pressure, triggering cavitation. During cavitation, bubbles burst in the high-pressure zone, generating high-frequency shock waves that continuously erode the throttling surfaces of the valve core and body, resulting in material spalling, increased surface roughness, and ultimately, valve sealing failure, significantly increased operating noise, and a substantial reduction in equipment lifespan.

[0003] Meanwhile, single-stage throttling structures cannot effectively disperse fluid impact forces, making it easy for vortex zones to form in the medium inflow channel, increasing flow resistance, limiting flow capacity, and making it difficult to meet the needs of high-pressure, high-velocity fluid systems in industries such as petroleum, chemical, and metallurgy for precise flow regulation and long-term stable operation.

[0004] In summary, current throttle valves suffer from poor throttling effect and insufficient flow capacity, necessitating the design of a new throttle valve to improve these issues. Utility Model Content

[0005] This application provides a throttle valve that can solve the problems of poor throttling effect and insufficient flow capacity of existing throttle valves.

[0006] This application provides a throttle valve, including: The valve body has a medium inlet channel, a throttling channel and a medium outlet channel arranged sequentially along the medium flow direction inside. A valve core is slidably connected in the throttling channel along the axial direction. The valve core includes a blocking section and a throttling section arranged axially from top to bottom. The throttling section includes a first wedge surface and a second wedge surface arranged axially from top to bottom; a first throttling gap is formed between the first wedge surface and the inner wall of the throttling channel, and a second throttling gap is formed between the second wedge surface and the inner wall of the throttling channel, wherein the flow area of ​​the first throttling gap is larger than the flow area of ​​the second throttling gap.

[0007] In some embodiments, two of the first wedge surface and two of the second wedge surface are disposed opposite to each other.

[0008] In some embodiments, a connecting surface is provided between the first wedge surface and the second wedge surface, and the plane containing the connecting surface is perpendicular to the axial direction of the medium inflow channel.

[0009] In some embodiments, an arc-shaped transition surface is provided between the first wedge surface and the connecting surface.

[0010] In some embodiments, the angle between the plane containing the first wedge surface and the axis of the valve core is smaller than the angle between the plane containing the second wedge surface and the axis of the valve core.

[0011] In some embodiments, the diameter of the blocking section is larger than the diameter of the throttling channel, and a frustum transition section is provided between the blocking section and the throttling section, the diameter of the frustum transition section gradually increasing from the throttling section to the blocking section.

[0012] In some embodiments, the top and bottom edges of the first wedge surface are both arc-shaped, and both the top and bottom edges are curved toward the direction of the sealing section.

[0013] In some embodiments, a valve sleeve is further included, which is disposed in the medium inflow channel. The inner wall of the valve sleeve is provided with a plurality of flow holes at equal intervals along the circumference. One end of each flow hole is connected to the medium inflow channel, and the other end is connected to the throttling channel.

[0014] In some embodiments, the angle between the axis of the through-flow hole and the axis of the medium inflow channel is 30° to 60°; the diameter of the through-flow hole is 1 / 5 to 1 / 3 of the inner diameter of the medium inflow channel.

[0015] In some embodiments, the inner wall of the throttling channel is provided with positioning holes that match the shape of the throttling section.

[0016] The beneficial effects of the technical solutions provided in this application include: This application provides a throttle valve, including: The valve body has a medium inlet channel, a throttling channel and a medium outlet channel arranged sequentially along the medium flow direction inside the valve body; A valve core is slidably connected in the throttling channel along the axial direction. The valve core includes a blocking section and a throttling section arranged axially from top to bottom. The throttling section includes a first wedge surface and a second wedge surface arranged axially from top to bottom; a first throttling gap is formed between the first wedge surface and the inner wall of the throttling channel, and a second throttling gap is formed between the second wedge surface and the inner wall of the throttling channel, wherein the flow area of ​​the first throttling gap is larger than the flow area of ​​the second throttling gap.

[0017] The throttling valve provided in this application employs a valve core design with a first wedge surface and a second wedge surface, which, together with the inner wall of the throttling channel, forms a first throttling gap and a second throttling gap with progressively decreasing flow area, thereby achieving multi-stage stepped throttling. This structure effectively avoids severe cavitation caused by a sudden drop in local pressure below the saturated vapor pressure during single-stage throttling by dispersing the concentrated pressure drop to two throttling stages. It significantly reduces the high-frequency impact and erosion of bubble collapse on the valve core and valve body sealing surfaces, not only extending the valve's service life and reducing operating noise, but also ensuring long-term sealing reliability. At the same time, this multi-stage flow guiding design can smooth the flow field and significantly weaken the eddy current intensity of the medium inflow channel, thereby improving the throttling effect and flow capacity of the throttling valve while greatly reducing flow resistance, achieving stable fluid throttling, reducing cavitation and wear, extending the valve's service life, and enabling it to adapt to harsh operating conditions of high pressure and high flow rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the overall structure of the throttle valve provided in an embodiment of this application; Figure 2 for Figure 1 Enlarged view of the central valve core; Figure 3 This is a side view of the valve core. Figure 4 for Figure 1 Enlarged view of the valve sleeve; Figure 5 This is a cross-sectional view of the valve sleeve along the horizontal direction.

[0020] In the picture: 1. Valve body flange; 2. Valve body; 3. Anti-impact sleeve; 4. Valve seat; 5. Second O-ring seal; 6. Second retaining ring; 7. Valve sleeve; 8. Valve core; 9. Valve cover; 10. Valve stem; 11. Fully threaded stud; 12. Second hexagonal nut; 13. Spring washer; 14. Valve stem packing; 15. Packing gasket; 16. Small round nut; 17. Threaded packing sleeve; 18. Electric support; 19. Thrust ball bearing; 20. Three-jaw valve stem nut; 21. Socket head cap screw; 22. Spring washer; 23. 24. Drive mechanism; 25. Bracket plug; 26. Oil injection cup; 27. First hexagonal nut; 28. Screw; 29. ​​Washer; 30. First retaining ring; 71. First O-ring seal; 81. Flow hole; 82. Blocking section; 83. Throttling section; 84. Frustum transition section; 201. Medium inflow channel; 202. Throttling channel; 203. Medium outflow channel; 221. Positioning hole; 801. First wedge surface; 802. Second wedge surface; 803. Connecting surface; 804. Arc-shaped transition surface. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] This application provides a throttle valve that can solve the problems of poor throttling effect and insufficient flow capacity of throttle valves in the prior art.

[0023] See Figures 1 to 3 As shown, this application embodiment provides a throttle valve, including: Valve body 2, which has a medium inflow channel 201, a throttling channel 202 and a medium outflow channel 203 arranged sequentially along the medium flow direction; valve core 8, which is slidably connected in the throttling channel 202 along the axial direction, and the valve core 8 includes a blocking section 81 and a throttling section 82 arranged from top to bottom along the axial direction. The throttling section 82 includes a first wedge surface 801 and a second wedge surface 802 arranged from top to bottom along the axial direction; a first throttling gap is formed between the first wedge surface 801 and the inner wall of the throttling channel 202, and a second throttling gap is formed between the second wedge surface 802 and the inner wall of the throttling channel 202, wherein the flow area of ​​the first throttling gap is larger than the flow area of ​​the second throttling gap.

[0024] The throttling valve provided in this application adopts a valve core 8 with a first wedge surface 801 and a second wedge surface 802, which together with the inner wall of the throttling channel 202 forms a first throttling gap and a second throttling gap with progressively decreasing flow area, thereby achieving multi-stage stepped throttling. This structure effectively avoids the severe cavitation phenomenon caused by the sudden drop in local pressure below the saturated vapor pressure during single-stage throttling by dispersing the concentrated pressure drop to two throttling stages. It significantly reduces the high-frequency impact and erosion of bubble collapse on the sealing surfaces of the valve core 8 and valve body 2, which not only extends the service life of the valve and reduces operating noise, but also ensures the long-term reliability of the seal. At the same time, this multi-stage flow guiding design can smooth the flow field and significantly weaken the eddy current intensity of the medium flowing into the channel 201. Thus, under the premise of greatly reducing flow resistance, it improves the throttling effect and flow capacity of the throttling valve, realizes smooth fluid throttling, reduces cavitation and wear, extends the service life of the valve, and enables it to adapt to harsh working conditions of high pressure and high flow rate.

[0025] In some optional embodiments, two first wedge surfaces 801 and two second wedge surfaces 802 are arranged opposite each other. By symmetrically arranging the first wedge surfaces 801 and the second wedge surfaces 802 on both sides, uniform distribution of fluid in the circumference and multi-point throttling are achieved, effectively eliminating local eddies and pressure fluctuations caused by uneven flow on one side, further reducing the risk of cavitation and improving throttling stability, thereby improving the valve's flow capacity under high-pressure conditions, while also dispersing fluid impact force and extending the wear life of the valve core 8.

[0026] In some alternative embodiments, such as Figure 2 and Figure 3 A connecting surface 803 is provided between the first wedge surface 801 and the second wedge surface 802. The plane of the connecting surface 803 is perpendicular to the axial direction of the medium inflow channel 201. The connecting surface 803, which is perpendicular to the axial direction, provides a smooth fluid transition path, avoids abrupt flow changes between the primary and secondary throttling gaps, significantly reduces turbulence and local pressure oscillations caused by sudden changes in flow velocity, thereby reducing operating noise and preventing the throttling surface from peeling off due to the rupture of bubbles at the connecting surface 803.

[0027] In some alternative embodiments, such as Figure 2 and Figure 3 An arc-shaped transition surface 804 is provided between the first wedge surface 801 and the connecting surface 803. The arc-shaped transition surface 804 makes the transition process of the fluid from the first-stage throttling to the second-stage throttling smoother, reduces flow resistance and local velocity peaks, effectively suppresses cavitation initiation, avoids stress concentration in the transition area, and extends the service life of the throttling surface.

[0028] In some alternative embodiments, the angle between the plane containing the first wedge surface 801 and the axis of the valve core 8 is smaller than the angle between the plane containing the second wedge surface 802 and the axis of the valve core 8. This angle design (smaller angle for the first wedge surface 801 and larger angle for the second wedge surface 802) ensures that the fluid first undergoes a gentle first-stage throttling followed by a steeper second-stage throttling, achieving precise control of the pressure gradient, avoiding a sudden drop in pressure differential during single-stage throttling, improving the cavitation elimination rate, and optimizing the linearity of flow regulation.

[0029] In some alternative embodiments, the diameter of the blocking section 81 is larger than the diameter of the throttling channel 202, and a frustum transition section 83 is provided between the blocking section 81 and the throttling section 82, the diameter of which gradually increases from the throttling section 82 to the blocking section 81. The large diameter design of the blocking section 81 reduces the fluid outlet velocity, and the gradual diameter of the frustum transition section 83 avoids abrupt changes in cross-section, significantly reducing outlet eddies and flow resistance, thereby improving flow capacity and preventing secondary cavitation caused by a sudden increase in flow velocity at the outlet of high-pressure fluid, ensuring the long-term stability of the valve under high flow conditions.

[0030] In some alternative embodiments, such as Figure 2 and Figure 3 The top and bottom edges of the first wedge surface 801 are both rounded, and both edges bend towards the direction of the sealing section 81. The rounded edges (bending towards the sealing section 81) guide the fluid to flow smoothly into the throttling gap, eliminate sudden changes in flow velocity and turbulent zones at the edges, reduce local wear on the throttling surface (wear rate decrease), and at the same time avoid bubble accumulation caused by sharp edges, further suppressing cavitation and noise.

[0031] In some alternative embodiments, such as Figure 4 and Figure 5 It also includes a valve sleeve 7, which is disposed within the medium inflow channel 201. Multiple flow-through holes 71 are evenly spaced along the circumference of the inner wall of the valve sleeve 7; one end of each flow-through hole 71 is connected to the medium inflow channel 201, and the other end is connected to the throttling channel 202. The valve sleeve 7 integrates multiple flow-through holes 71 to achieve uniform circumferential distribution of the fluid, ensuring that the fluid entering the first-stage throttling gap is free from flow deviation, completely eliminating the vortex region in the medium inflow channel 201, reducing flow resistance, expanding the flow regulation range, and meeting the precise control requirements of high-viscosity fluid systems.

[0032] In some optional embodiments, the angle between the axis of the through-flow orifice 71 and the axis of the medium inflow channel 201 is 30° to 60°; the diameter of the through-flow orifice 71 is 1 / 5 to 1 / 3 of the inner diameter of the medium inflow channel 201. This angle and diameter range ensures that the fluid enters the throttling gap in the optimal direction (avoiding direct impact on the throttling surface) and at the optimal flow rate, thereby improving the uniformity of the flow velocity distribution in the medium inflow channel 201, effectively preventing cavitation caused by excessively high local flow velocities, and simultaneously ensuring the medium flow capacity.

[0033] In some alternative embodiments, such as Figure 1 The inner wall of the throttling channel 202 is provided with a positioning hole 221 that matches the shape of the throttling section 82. The positioning hole 221 matches the shape of the throttling section 82 to ensure that the throttling gap is uniform when the valve core 8 moves, avoiding uneven gap and sealing failure caused by the valve core 8 offset, thereby improving the flow regulation accuracy and ensuring the service life of the valve.

[0034] When the throttling shut-off valve with a two-stage throttling wedge surface of this application is in operation, the fluid first enters from the medium inflow channel 201 of the valve body. A portion of the fluid flows directly along the medium inflow channel 201 to the first throttling gap, while the other portion of the fluid enters the first throttling gap evenly through the flow passage 71 of the valve sleeve 7. Within the first throttling gap, the fluid completes the first-stage throttling under the action of the first wedge surface 801 and the inner wall of the throttling channel 202, and the pressure and flow rate are initially regulated. Subsequently, the fluid enters the second throttling gap and completes the second-stage throttling under the action of the second wedge surface 802, further reducing the fluid pressure and flow rate, so that the fluid enters the medium outflow channel 203 in a stable state and is finally transported to the downstream system.

[0035] The valve core 8 is driven to move axially by a drive mechanism, which changes the flow area between the first and second throttling gaps, thereby achieving precise regulation of the fluid flow rate. When the valve core 8 moves upward, the throttling gap increases, and the flow rate increases; when the valve core 8 moves downward, the throttling gap decreases, and the flow rate decreases.

[0036] Figure 1 In the valve body, valve body 2 and valve body flange 1 form the main frame for pipeline connection; valve seat 4 and anti-impact sleeve 3 are embedded inside valve body 2, anti-impact sleeve 3 protects valve seat 4, and valve seat 4 is provided with a second O-ring seal 5 and a second retaining ring 6; valve sleeve 7 is installed in the medium inflow channel 201 of valve body, and valve core 8 is provided with valve sleeve 7; valve stem 10 passes through valve cover 9, valve stem 10 is connected to valve core 8, driving valve core 8 to move axially, valve stem 10 is provided with a small round nut 16, and gasket 28, first retaining ring 29 and first O-ring seal 30 are provided at the connection between valve stem 10 and valve body 2; valve body 2 is provided with a fully threaded stud. 11. The second hexagonal nut 12 (which can be a type 2 hexagonal nut), spring washer 13, packing gasket 15, valve stem packing 14 and threaded packing sleeve 17 serve a sealing function; the throttle valve is provided with a drive mechanism 23, the drive mechanism 23 is provided with an electric bracket 18 that drives the valve stem 10 to move, the electric bracket 18 is provided with a thrust ball bearing 19, a three-jaw valve stem nut 20, an internal hexagonal head screw 21, a spring washer 22 and a bracket plug 24, and is provided with a pressure injection cup 25 for lubricating the bearing, and is provided with a first hexagonal nut 26 (which can be a type 1 hexagonal nut) and screw 27.

[0037] The drive mechanism 23 can also be a handwheel drive mechanism. When a handwheel drive mechanism is used, the handwheel is fixedly connected to the upper end of the valve stem 10, and the outer peripheral wall of the valve stem 10 is provided with an external thread. The top of the valve cover 9 is provided with an internal thread sleeve that matches the external thread. By rotating the handwheel, the valve stem 10 is driven to move axially. The drive mechanism 23 can also be an electric drive mechanism. When an electric drive mechanism is used, the electric drive mechanism includes a motor and a gearbox. The output end of the motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the upper end of the valve stem 10. The automatic adjustment of the valve core 8 is achieved by driving the motor.

[0038] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A throttle valve, characterized in that, include: The valve body (2) has a medium inflow channel (201), a throttling channel (202) and a medium outflow channel (203) arranged sequentially along the medium flow direction inside it; The valve core (8) is slidably connected in the throttling channel (202) along the axial direction. The valve core (8) includes a blocking section (81) and a throttling section (82) arranged from top to bottom along the axial direction. The throttling section (82) includes a first wedge surface (801) and a second wedge surface (802) arranged axially from top to bottom; a first throttling gap is formed between the first wedge surface (801) and the inner wall of the throttling channel (202), and a second throttling gap is formed between the second wedge surface (802) and the inner wall of the throttling channel (202), wherein the flow area of ​​the first throttling gap is greater than the flow area of ​​the second throttling gap.

2. The throttle valve as described in claim 1, characterized in that: The first wedge surface (801) and the second wedge surface (802) are each provided in two opposite directions.

3. The throttle valve as described in claim 1, characterized in that: A connecting surface (803) is provided between the first wedge surface (801) and the second wedge surface (802), and the plane of the connecting surface (803) is perpendicular to the axial direction of the medium inflow channel (201).

4. The throttle valve as described in claim 3, characterized in that: An arc-shaped transition surface (804) is provided between the first wedge surface (801) and the connecting surface (803).

5. The throttle valve as described in claim 1, characterized in that: The angle between the plane containing the first wedge surface (801) and the axis of the valve core (8) is smaller than the angle between the plane containing the second wedge surface (802) and the axis of the valve core (8).

6. The throttle valve as described in claim 1, characterized in that: The diameter of the blocking section (81) is larger than the diameter of the throttling channel (202), and a frustum transition section (83) is provided between the blocking section (81) and the throttling section (82), the diameter of the frustum transition section (83) gradually increases from the throttling section (82) to the blocking section (81).

7. The throttle valve as described in claim 1, characterized in that: The top and bottom edges of the first wedge surface (801) are both arc-shaped, and both the top and bottom edges are bent toward the direction of the sealing section (81).

8. The throttle valve as described in claim 1, characterized in that: It also includes a valve sleeve (7), which is disposed in the medium inflow channel (201). The inner wall of the valve sleeve (7) is provided with a plurality of flow holes (71) at equal intervals along the circumference; and one end of the flow hole (71) is connected to the medium inflow channel (201), and the other end is connected to the throttling channel (202).

9. The throttle valve as described in claim 8, characterized in that: The angle between the axis of the through-flow hole (71) and the axis of the medium inflow channel (201) is 30° to 60°; the diameter of the through-flow hole (71) is 1 / 5 to 1 / 3 of the inner diameter of the medium inflow channel (201).

10. The throttle valve as claimed in claim 1, characterized in that: The inner wall of the throttling channel (202) is provided with a positioning hole (221) that matches the shape of the throttling section (82).

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